>>12842230It´s possible,copied from other site "Lacking any copies of these vital genes, a YY zygote would spontaneously abort, probably very early. Too early for a pregnancy to even be noticed.There is a theoretically potentially viable way to make a YY human with genetic engineering. You can start with an XYY genotype, and then fuse the X to another autosomal chromosome. You then have to fiddle with the regulation of the former X chromosome genes to account for the fact that half of them need to be inactivated at random. This, if done just right, should give you a YY human with one additional atypical large chromosome, who will look like a normal human male.
Alternately you break the X up into many pieces and scatter those pieces into all the other chromosomes, such that all the chromosomes still look close to normal, if you don’t want to have a single obvious atypical autosome on your karyotype.
